//! for more info).
//! - `Keysend` - send funds to a node without an invoice
//! (see the [`Keysend` feature assignment proposal](https://github.com/lightning/bolts/issues/605#issuecomment-606679798) for more information).
+//! - `Trampoline` - supports receiving and forwarding Trampoline payments
+//! (see the [`Trampoline` feature proposal](https://github.com/lightning/bolts/pull/836) for more information).
//!
//! LDK knows about the following features, but does not support them:
//! - `AnchorsNonzeroFeeHtlcTx` - the initial version of anchor outputs, which was later found to be
//! [BOLT #9]: https://github.com/lightning/bolts/blob/master/09-features.md
//! [messages]: crate::ln::msgs
-use crate::{io, io_extras};
+#[allow(unused_imports)]
use crate::prelude::*;
+
+use crate::{io, io_extras};
use core::{cmp, fmt};
use core::borrow::Borrow;
use core::hash::{Hash, Hasher};
use crate::util::ser::{Readable, WithoutLength, Writeable, Writer};
mod sealed {
+ #[allow(unused_imports)]
use crate::prelude::*;
use crate::ln::features::Features;
ChannelType | SCIDPrivacy,
// Byte 6
ZeroConf,
+ // Byte 7
+ Trampoline,
]);
define_context!(NodeContext, [
// Byte 0
ChannelType | SCIDPrivacy,
// Byte 6
ZeroConf | Keysend,
+ // Byte 7
+ Trampoline,
]);
define_context!(ChannelContext, []);
define_context!(Bolt11InvoiceContext, [
,
// Byte 6
PaymentMetadata,
+ // Byte 7
+ Trampoline,
]);
define_context!(OfferContext, []);
define_context!(InvoiceRequestContext, []);
define_feature!(55, Keysend, [NodeContext],
"Feature flags for keysend payments.", set_keysend_optional, set_keysend_required,
supports_keysend, requires_keysend);
+ define_feature!(57, Trampoline, [InitContext, NodeContext, Bolt11InvoiceContext],
+ "Feature flags for Trampoline routing.", set_trampoline_routing_optional, set_trampoline_routing_required,
+ supports_trampoline_routing, requires_trampoline_routing);
// Note: update the module-level docs when a new feature bit is added!
#[cfg(test)]
}
impl<T: sealed::Context> Hash for Features<T> {
fn hash<H: Hasher>(&self, hasher: &mut H) {
- self.flags.hash(hasher);
+ let mut nonzero_flags = &self.flags[..];
+ while nonzero_flags.last() == Some(&0) {
+ nonzero_flags = &nonzero_flags[..nonzero_flags.len() - 1];
+ }
+ nonzero_flags.hash(hasher);
}
}
impl<T: sealed::Context> PartialEq for Features<T> {
fn eq(&self, o: &Self) -> bool {
- self.flags.eq(&o.flags)
+ let mut o_iter = o.flags.iter();
+ let mut self_iter = self.flags.iter();
+ loop {
+ match (o_iter.next(), self_iter.next()) {
+ (Some(o), Some(us)) => if o != us { return false },
+ (Some(b), None) | (None, Some(b)) => if *b != 0 { return false },
+ (None, None) => return true,
+ }
+ }
}
}
impl<T: sealed::Context> PartialOrd for Features<T> {
}
}
+impl<T: sealed::RouteBlinding> Features<T> {
+ #[cfg(test)]
+ pub(crate) fn clear_route_blinding(&mut self) {
+ <T as sealed::RouteBlinding>::clear_bits(&mut self.flags);
+ }
+}
+
#[cfg(test)]
impl<T: sealed::UnknownFeature> Features<T> {
pub(crate) fn unknown() -> Self {
assert!(!converted_features.supports_any_optional_bits());
assert!(converted_features.requires_static_remote_key());
}
+
+ #[test]
+ #[cfg(feature = "std")]
+ fn test_excess_zero_bytes_ignored() {
+ // Checks that `Hash` and `PartialEq` ignore excess zero bytes, which may appear due to
+ // feature conversion or because a peer serialized their feature poorly.
+ use std::collections::hash_map::DefaultHasher;
+ use std::hash::{Hash, Hasher};
+
+ let mut zerod_features = InitFeatures::empty();
+ zerod_features.flags = vec![0];
+ let empty_features = InitFeatures::empty();
+ assert!(empty_features.flags.is_empty());
+
+ assert_eq!(zerod_features, empty_features);
+
+ let mut zerod_hash = DefaultHasher::new();
+ zerod_features.hash(&mut zerod_hash);
+ let mut empty_hash = DefaultHasher::new();
+ empty_features.hash(&mut empty_hash);
+ assert_eq!(zerod_hash.finish(), empty_hash.finish());
+ }
}